51808925 has 18 divisors (see below), whose sum is σ = 74733498. Its totient is φ = 35525280.

The previous prime is 51808919. The next prime is 51808943. The reversal of 51808925 is 52980815.

51808925 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 729316 + 51079609 = 854^2 + 7147^2 .

It is not a de Polignac number, because 51808925 - 2⁴ = 51808909 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 19922 + ... + 22371.

It is an arithmetic number, because the mean of its divisors is an integer number (4151861).

Almost surely, 2^51808925 is an apocalyptic number.

It is an amenable number.

51808925 is a deficient number, since it is larger than the sum of its proper divisors (22924573).

51808925 is a wasteful number, since it uses less digits than its factorization.

51808925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42317 (or 42305 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 51808925 is about 7197.8416903958. The cubic root of 51808925 is about 372.7933817716.

The spelling of 51808925 in words is "fifty-one million, eight hundred eight thousand, nine hundred twenty-five".